DOI: 10.1017/s0031182013000036. Fine structure of Metchnikovella incurvata Caullery and Mesnil 1914 (microsporidia), a hyperparasite of gregarines Polyrhabdina sp. from the polychaete Pygospio elegans

Fine structure of Metchnikovella incurvata Caullery and Mesnil 1914 (microsporidia), a hyperparasite of gregarines Polyrhabdina sp. from the polychaete Pygospio elegans

10.1017/s0031182013000036

Crossref journal-article

Cambridge University Press (CUP)

Parasitology (56)

Abstract

SUMMARYClass Rudimicrosporea Sprague 1977, with its single family Metchnikovellidae, comprises hyperparasites of gregarines from the guts of marine invertebrates. Metchnikovellids remain poorly studied in spite of their significance to the evolutionary history of microsporidia; their ultrastructure and life cycles require further investigation. Here we present results of the light- and electron-microscopy study of Metchnikovella incurvata Caulleri and Mesnil 1914, isolated from lecudinid gregarines, parasitizing polychaetes Pygospio elegans in the White Sea littoral zone, and yet described only on the light-microscopic level. The life cycle of this microsporidium includes 2 sporogonies: free (FS) and sac-bound (SBS). In FS, sporonts develop into multinuclear cells (sporogonial plasmodia), which generate sporoblasts and free spores residing in direct contact with the host cytoplasm. Electron microscopy revealed their metchnikovellidean structure: a horseshoe-shaped nucleus, short manubrium perpendicular to the long axis of the spore, and a polar cap in a separate membrane container. Merogony was not observed. The earliest stages of SBS were chains of binucleate cells. They underwent a series of nuclear and cell divisions, produced extracellular envelopes, and split into boomerang-shaped spore sacs, containing up to 16 spores each. Ultrastructure and sizes of sac-bounded spores were similar to those of free-living ones. An amended diagnosis of M. incurvata is provided.

Bibliography

SOKOLOVA, Y. Y., PASKEROVA, G. G., ROTARI, Y. M., NASSONOVA, E. S., & SMIRNOV, A. V. (2013). Fine structure of Metchnikovella incurvata Caullery and Mesnil 1914 (microsporidia), a hyperparasite of gregarines Polyrhabdina sp. from the polychaete Pygospio elegans. Parasitology, 140(7), 855â867.

Authors 5

Y. Y. SOKOLOVA (first)
G. G. PASKEROVA (additional)
Y. M. ROTARI (additional)
E. S. NASSONOVA (additional)
A. V. SMIRNOV (additional)

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Dates

Type	When
Created	12 years, 6 months ago (Feb. 28, 2013, 9:40 p.m.)
Deposited	6 years, 4 months ago (April 23, 2019, 5:42 p.m.)
Indexed	9 months, 2 weeks ago (Nov. 19, 2024, 11:40 a.m.)
Issued	12 years, 6 months ago (Feb. 28, 2013)
Published	12 years, 6 months ago (Feb. 28, 2013)
Published Online	12 years, 6 months ago (Feb. 28, 2013)
Published Print	12 years, 3 months ago (June 1, 2013)

Funders 0

None

BibTeX

@article{SOKOLOVA_2013, title={Fine structure of Metchnikovella incurvata Caullery and Mesnil 1914 (microsporidia), a hyperparasite of gregarines Polyrhabdina sp. from the polychaete Pygospio elegans}, volume={140}, ISSN={1469-8161}, url={http://dx.doi.org/10.1017/s0031182013000036}, DOI={10.1017/s0031182013000036}, number={7}, journal={Parasitology}, publisher={Cambridge University Press (CUP)}, author={SOKOLOVA, Y. Y. and PASKEROVA, G. G. and ROTARI, Y. M. and NASSONOVA, E. S. and SMIRNOV, A. V.}, year={2013}, month=feb, pages={855–867} }

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